JP2000242961A - Lens supporting structure for optical head and optical head - Google Patents
Lens supporting structure for optical head and optical headInfo
- Publication number
- JP2000242961A JP2000242961A JP11043750A JP4375099A JP2000242961A JP 2000242961 A JP2000242961 A JP 2000242961A JP 11043750 A JP11043750 A JP 11043750A JP 4375099 A JP4375099 A JP 4375099A JP 2000242961 A JP2000242961 A JP 2000242961A
- Authority
- JP
- Japan
- Prior art keywords
- supported
- lens
- optical axis
- support
- optical head
- 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.)
- Withdrawn
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 207
- 230000002093 peripheral effect Effects 0.000 claims abstract description 22
- 239000004033 plastic Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004512 die casting Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Optical Head (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、光ディスク装
置、光磁気ディスク装置等に用いられる光ヘッドのレン
ズ支持構造に関し、温度変化による光軸変化が生じない
ようにしたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens support structure for an optical head used in an optical disk device, a magneto-optical disk device, etc., in which an optical axis does not change due to a temperature change.
【０００２】[0002]
【従来の技術】光ヘッド内に非可動レンズ（対物レンズ
のような可動レンズでないレンズ）を取り付ける取付構
造の一例を図２に示す。光ヘッド内の固定部分１０に
は、レンズ保持用のＶ字溝１２が形成されている。Ｖ字
溝１２にはレンズ１４がその光軸（中心軸）１６を光ヘ
ッド内の所定の光軸位置に一致させて収容されている。
固定部分１０には、押えばね（板ばね）１８がその一端
部をねじ１９で止めて固定されている。押えばね１８の
他端部付近の下面はレンズ１４の外周面１４ａに押圧当
接して、レンズ１４をＶ字溝１２に押圧保持する。2. Description of the Related Art FIG. 2 shows an example of a mounting structure for mounting a non-movable lens (a non-movable lens such as an objective lens) in an optical head. A V-shaped groove 12 for holding a lens is formed in a fixed portion 10 in the optical head. A lens 14 is accommodated in the V-shaped groove 12 with its optical axis (center axis) 16 aligned with a predetermined optical axis position in the optical head.
A pressing spring (leaf spring) 18 is fixed to the fixed portion 10 with one end thereof fixed with a screw 19. The lower surface near the other end of the pressing spring 18 presses and contacts the outer peripheral surface 14 a of the lens 14 to press and hold the lens 14 in the V-shaped groove 12.
【０００３】図２のレンズ支持構造によれば、温度変化
によりレンズ１４が膨張、収縮すると、レンズ１４の径
が例えば符号１４′で示すように変化し、これに伴い光
軸１６の位置が符号１６′で示すように変化する（ずれ
る）。このずれ量ΔＬは次式で表される。 ΔＬ＝ｒ×ΔＴ×Ｋ ただし、ｒ：レンズ半径 ΔＴ：温度変化 Ｋ：線膨張係数According to the lens support structure shown in FIG. 2, when the lens 14 expands and contracts due to a change in temperature, the diameter of the lens 14 changes as shown by reference numeral 14 ', and the position of the optical axis 16 changes accordingly. It changes (shifts) as indicated by 16 '. This shift amount ΔL is expressed by the following equation. ΔL = r × ΔT × K where r: lens radius ΔT: temperature change K: linear expansion coefficient
【０００４】光ヘッドのレンズは低コスト化、軽量化等
のためプラスチックレンズが多く用いられているが、プ
ラスチックレンズは線膨張係数Ｋが大きいため、温度変
化ΔＴによる光軸１６のずれ量ΔＬが大きかった。光軸
１６のずれ量ΔＬを小さくするためには、次の対策が必
要であった。 （ａ） 線膨張係数の小さいレンズ（ガラスレンズ等）
に代える。 （ｂ） 半径ｒの値を小さくするために、線膨張係数の
小さな金属などで外筒を作り、この外筒内にレンズ１４
を保持する。As the lens of the optical head, a plastic lens is often used for cost reduction and weight reduction. However, since the plastic lens has a large linear expansion coefficient K, the displacement amount ΔL of the optical axis 16 due to a temperature change ΔT is small. It was big. In order to reduce the amount of deviation ΔL of the optical axis 16, the following measures were required. (A) Lens with small linear expansion coefficient (glass lens, etc.)
Replace with (B) In order to reduce the value of the radius r, an outer cylinder is made of metal or the like having a small coefficient of linear expansion.
Hold.
【０００５】しかし、（ａ）の方法はレンズが高価とな
り、（ｂ）の方法は外筒を使う分高価となる問題があっ
た。However, the method (a) has a problem that the lens becomes expensive, and the method (b) has a problem that it is expensive due to the use of the outer cylinder.
【０００６】そこで、本出願人はこのような従来の技術
における問題点を解決して、温度による光軸変化が生じ
ないようにした光ヘッドのレンズ支持構造を別の特許願
で提案した。その構造の一例を図３に示す。被支持体２
０はプラスチックの一体成型品で全体が作られている。
被支持体２０には円柱状の外形を有するレンズ本体２２
と突出部２４，２６が構成されている。突出部２４，２
６はレンズ本体２２の周縁部の、該レンズ本体２２の光
軸（中心軸）２８を挟んで互いに反対側の位置に光軸２
８と平行な方向に延在して構成されている。突出部２
４，２６の同じ側の側面２４ａ，２６ａは第１、第２の
被支持面を構成する。被支持面２４ａ，２６ａは、光軸
２８を通る第１の平面３０上に構成されている。Accordingly, the present applicant has proposed another patent application for a lens support structure for an optical head which solves such problems in the prior art and prevents the optical axis from changing due to temperature. FIG. 3 shows an example of the structure. Supported 2
Numeral 0 is an integral molded product of plastic and is entirely made.
A lens body 22 having a cylindrical outer shape is provided on the supported body 20.
And protruding portions 24 and 26. Projections 24, 2
Reference numeral 6 denotes an optical axis 2 at a position on the periphery of the lens body 22 opposite to the optical axis (center axis) 28 of the lens body 22.
8 is configured to extend in a direction parallel to the direction. Projection 2
The side surfaces 24a and 26a on the same side of the fourth and 26 constitute first and second supported surfaces. The supported surfaces 24a and 26a are formed on a first plane 30 passing through the optical axis 28.
【０００７】光ヘッドの固定部分には所定幅の溝３２を
形成した支持部３４が構成されている。支持部３４は金
属ダイカスト等で作られている。溝３２の開口端両側の
位置で支持部３４の上面３４ａ，３４ｂは第１、第２の
支持面を構成している。被支持体２０は溝３２内に挿入
されて、第１、第２の被支持面２４ａ，２６ａを第１、
第２の支持面３４ａ，３４ｂにそれぞれ当接させて支持
部３４に支持されている。溝３２の幅Ｗは被支持体２０
の直径Ｌとほぼ同じかまたはわずかに大きく形成されて
いる。レンズ本体２２の光軸２８は光ヘッド内の所定の
光軸位置に一致している。[0007] A support portion 34 having a groove 32 of a predetermined width is formed in a fixed portion of the optical head. The support part 34 is made of metal die casting or the like. The upper surfaces 34a and 34b of the support portion 34 at the positions on both sides of the open end of the groove 32 constitute first and second support surfaces. The supported body 20 is inserted into the groove 32 to move the first and second supported surfaces 24a and 26a to the first and second surfaces.
The support portions 34 support the second support surfaces 34a and 34b, respectively. The width W of the groove 32 is
Is formed to be almost the same as or slightly larger than the diameter L. The optical axis 28 of the lens body 22 coincides with a predetermined optical axis position in the optical head.
【０００８】押えばね３６は板ばねで構成され、一端
（図示せず）が支持部３４にねじ等で固定され、他端３
６ａの付近の一面が被支持体２０の外周面２０ａの頂部
（光軸２８を通りかつ第１の平面と直交する平面と外周
面２０ａとの交線上の位置）に押圧当接している。これ
により、被支持体２０は第１、第２の被支持面２４ａ，
２６ａが第１、第２の支持面３４ａ，３４ｂに押圧当接
して支持部３４に固定される。The presser spring 36 is constituted by a leaf spring, one end (not shown) of which is fixed to the support portion 34 by screws or the like, and the other end 3.
One surface near 6a is in pressure contact with the top of the outer peripheral surface 20a of the supported body 20 (the position on the intersection line between the outer peripheral surface 20a and the plane passing through the optical axis 28 and orthogonal to the first plane). As a result, the supported body 20 has the first and second supported surfaces 24a,
26a is pressed and abutted on the first and second support surfaces 34a and 34b, and is fixed to the support portion 34.
【０００９】以上の構成によれば、第１、第２の被支持
面２４ａ，２６ａと第１、第２の支持面３４ａ，３４ｂ
との当接面は、光軸２８を通る第１の平面３０上に構成
されているので、温度変化により被支持体２０が膨張、
収縮しても光軸２８の第１の平面３０に直角な方向の位
置は変化しない。また、被支持体２０の幅方向は溝３２
の幅Ｗで規制されているので、光軸２８の第１の平面３
０に沿った方向の位置は変化しない。According to the above arrangement, the first and second supported surfaces 24a and 26a and the first and second supported surfaces 34a and 34b are provided.
Is formed on the first plane 30 passing through the optical axis 28, so that the supported body 20 expands due to a temperature change,
Even if contracted, the position of the optical axis 28 in the direction perpendicular to the first plane 30 does not change. The width direction of the supported body 20 is the groove 32.
Is restricted by the width W of the first plane 3 of the optical axis 28.
The position in the direction along 0 does not change.
【００１０】[0010]
【発明が解決しようとする課題】複数の光学部品が配置
されている光ヘッドの光学系においては、１つのレンズ
について温度変化による光軸の変化が生じないようにし
ても、他の光学部品の光軸が温度変化により変化すれ
ば、光学系全体としては光軸位置が変化する。また、支
持部（光学ヘッドの固定部分）の温度変化による膨張、
収縮によっても光学系全体の光軸位置が変化する。In an optical system of an optical head in which a plurality of optical components are arranged, even if one lens does not change its optical axis due to a change in temperature, the other optical components do not. If the optical axis changes due to a change in temperature, the position of the optical axis changes as a whole of the optical system. In addition, expansion due to temperature change of the support portion (fixed portion of the optical head),
The optical axis position of the entire optical system also changes due to the contraction.
【００１１】この発明は上述の点に鑑みてなされたもの
で、温度変化による光学系全体の光軸の変化を簡易な構
成で抑制することができる光ヘッドのレンズ支持構造お
よび該レンズ支持構造を有する光ヘッドを提供しようと
するものである。The present invention has been made in view of the above points, and has a lens support structure for an optical head and a lens support structure capable of suppressing a change in the optical axis of the entire optical system due to a temperature change with a simple configuration. It is intended to provide an optical head having the same.
【００１２】[0012]
【課題を解決するための手段】この発明のレンズ支持構
造は、レンズ本体を固定配置した被支持体を光ヘッド本
体の支持部に支持して該被支持体を該光ヘッドの所定の
光軸位置に支持する構造であって、前記被支持体が前記
レンズ本体の周縁部の、該レンズ本体の光軸を挟んで互
いに反対側の位置に第１、第２の被支持面を有し、前記
支持部が前記被支持体の前記第１、第２の被支持面を当
接支持する第１、第２の支持面を有し、前記被支持体と
前記支持部との間に弾性部材による弾性力を介在させ
て、前記第１、第２の被支持面を前記第１、第２の支持
面にそれぞれ押圧当接して、該被支持体を該支持部に支
持してなり、前記第１、第２の被支持面が前記レンズ本
体の光軸に対して微少距離隔てて平行な第１の平面上に
構成されているものである。According to the present invention, there is provided a lens supporting structure in which a supported body having a fixed lens body is supported on a supporting portion of an optical head body and the supported body is fixed to a predetermined optical axis of the optical head. A support structure, wherein the supported body has first and second supported surfaces at positions opposite to each other with respect to an optical axis of the lens body, at a peripheral portion of the lens body, The support portion has first and second support surfaces for abutting and supporting the first and second supported surfaces of the supported member, and an elastic member is provided between the supported member and the support portion. The first and second supported surfaces are pressed against and contacted with the first and second support surfaces, respectively, with the elastic force of The first and second supported surfaces are formed on a first plane parallel to the optical axis of the lens body at a small distance from the optical axis. A.
【００１３】このレンズ支持構造によれば、レンズ本体
を有する被支持体は第１，第２の被支持面を通る第１の
平面に支持されることになる。この第１の平面はレンズ
本体の光軸に対して微少距離隔てて平行に配置されてい
るので、温度変化による被支持体の膨張、収縮により、
該被支持体の光軸は微少量変化する。一方、光ヘッド内
の光軸は該光ヘッド内の各光学部品および支持部の温度
変化による膨張、収縮によって変化する。したがって、
前記被支持体についてレンズ本体の光軸と第１の平面と
の間の前記微少距離の方向および値を好適に設定するこ
とにより、光ヘッド内の各光学部品および支持部の温度
変化による光軸の変化を打ち消して、光検出器の受光面
での光軸の変化を抑えることができる。温度変化による
光検出器の受光面での光軸の変化を最大限に抑えること
ができるレンズ本体の光軸と第１の平面との間の前記微
少距離の方向および値の設計は、様々な微少距離の方向
および値に設計した被支持体を作成し、他の光学素子等
の設計がすべて終了し該光学素子等が組み込まれている
光ヘッドに該被支持体を順次入れ替えて組み込み、温度
変化による光検出器上での光軸の変化をそれぞれ測定
し、光軸の変化が最も小さくなる設計を探し出すことに
より行うことができる。同一設計の光ヘッドであれば、
温度変化による光検出器上での光軸の変化はほぼ定まる
ので、共通の設計の被支持体を用いることができる。According to this lens supporting structure, the supported body having the lens body is supported on the first plane passing through the first and second supported surfaces. Since the first plane is disposed parallel to the optical axis of the lens body at a minute distance, the expansion and contraction of the supported member due to a temperature change causes
The optical axis of the supported member changes by a small amount. On the other hand, the optical axis in the optical head changes due to expansion and contraction due to a temperature change of each optical component and the supporting portion in the optical head. Therefore,
By suitably setting the direction and value of the minute distance between the optical axis of the lens body and the first plane with respect to the supported body, the optical axis due to the temperature change of each optical component and the support in the optical head And the change of the optical axis on the light receiving surface of the photodetector can be suppressed. The design of the direction and value of the minute distance between the optical axis of the lens body and the first plane, which can minimize the change of the optical axis on the light receiving surface of the photodetector due to the temperature change, can be various. A supported body designed in the direction and value of a minute distance is created, the design of all other optical elements is completed, and the supported body is sequentially replaced and incorporated into an optical head in which the optical elements and the like are incorporated, and the temperature is set. This can be performed by measuring the change of the optical axis on the photodetector due to the change, and searching for a design that minimizes the change of the optical axis. If the optical head has the same design,
Since the change in the optical axis on the photodetector due to the temperature change is substantially determined, a supported member having a common design can be used.
【００１４】また、この発明の別のレンズ支持構造は、
前記被支持体が前記レンズ本体の周縁部の、該レンズ本
体の光軸を挟んで互いに反対側の位置に第３、第４の被
支持面をさらに有し、前記支持部が該第３、第４の被支
持面を当接支持する第３、第４の支持面をさらに有し、
前記弾性部材による弾性力または前記被支持体と前記支
持部との間に別途介在する弾性部材による弾性力によ
り、前記第３、第４の被支持面を前記第３、第４の支持
面にそれぞれ押圧当接して、該被支持体を該支持部に支
持してなり、前記第３、第４の被支持面が前記レンズ本
体の光軸に対して微少距離隔てて平行な第２の平面上に
構成されているものである。Further, another lens support structure of the present invention comprises:
The supported body further has third and fourth supported surfaces at positions on the peripheral edge of the lens body opposite to each other with respect to the optical axis of the lens body, and the support portion includes the third and fourth supported surfaces. A third supporting surface for supporting the fourth supported surface in contact with the fourth supporting surface;
The third and fourth supported surfaces are moved to the third and fourth support surfaces by the elastic force of the elastic member or the elastic force of an elastic member separately provided between the supported member and the support portion. A second plane parallel to the third and fourth supported surfaces at a minute distance from the optical axis of the lens body, wherein each of the third and fourth supported surfaces is pressed against and supported by the supporting portion; It is configured above.
【００１５】この別のレンズ支持構造によれば、レンズ
本体を有する被支持体は第１，第２の被支持面を通る第
１の平面および第３，第４の被支持面を通る第２の平面
によって２方向に支持されることになる。これら第１、
第２の平面はレンズ本体の光軸に対してそれぞれ微少距
離隔てて平行に配置されているので、温度変化による被
支持体の膨張、収縮により、該被支持体の光軸は２方向
に微少量変化する。一方、光ヘッド内の光軸は該光ヘッ
ド内の各光学部品および支持部の温度変化による膨張、
収縮によって変化する。したがって、前記被支持体につ
いてレンズ本体の光軸と第１、第２の平面との間の前記
微少距離の方向および値をそれぞれ好適に設定すること
により、光ヘッド内の各光学部品および支持部の温度変
化による光軸の変化を打ち消して、光検出器の受光面で
の光軸の変化を２方向について抑えることができる。温
度変化による光検出器の受光面での光軸の変化を最大限
に抑えることができるレンズ本体の光軸と第１、第２の
平面との間の前記微少距離の方向および値の設計は、様
々な微少距離の方向および値に設計した被支持体を作成
し、前記同様に、他の光学素子等の設計がすべて終了し
該光学素子等が組み込まれている光ヘッドに該被支持体
を順次入れ替えて組み込み、温度変化による光検出器上
での光軸の変化をそれぞれ測定し、光軸の変化が最も小
さくなる設計を探し出すことにより行うことができる。According to this another lens supporting structure, the supported body having the lens body is the first plane passing through the first and second supported surfaces and the second plane passing through the third and fourth supported surfaces. Are supported in two directions. These first,
Since the second plane is disposed in parallel with the optical axis of the lens body at a minute distance from each other, the optical axis of the supported body is slightly fine in two directions due to expansion and contraction of the supported body due to a temperature change. Changes a small amount. On the other hand, the optical axis in the optical head expands due to a temperature change of each optical component and the supporting portion in the optical head,
It changes by contraction. Therefore, by suitably setting the direction and value of the minute distance between the optical axis of the lens body and the first and second planes of the supported body, each optical component and the support section in the optical head are set. The change in the optical axis due to the temperature change can be canceled, and the change in the optical axis on the light receiving surface of the photodetector can be suppressed in two directions. The design of the direction and value of the minute distance between the optical axis of the lens body and the first and second planes, which can minimize the change of the optical axis on the light receiving surface of the photodetector due to the temperature change, In the same manner as described above, a supported body designed in various directions and values of minute distances is created, and the design of the other optical elements and the like is completed, and the supported body is mounted on an optical head in which the optical elements and the like are incorporated. Are sequentially replaced, and the change of the optical axis on the photodetector due to the temperature change is measured, and the design that minimizes the change of the optical axis is searched for.
【００１６】この発明のさらに別のレンズ支持構造は、
前記被支持体が前記レンズ本体の周縁部に第３の被支持
面をさらに有し、前記支持部が該第３の被支持面を当接
支持する第３の支持面をさらに有し、前記弾性部材によ
る弾性力または前記被支持体と前記支持部との間に別途
介在する弾性部材による弾性力により、前記第３の被支
持面を前記第３の支持面にそれぞれ押圧当接して、該被
支持体を該支持部に支持してなり、前記第３の被支持面
が、前記レンズ本体の光軸に対して微少距離隔てて平行
でかつ前記第１の平面に直交する第２の平面上に構成さ
れているものである。Still another lens support structure according to the present invention is as follows.
The supported member further has a third supported surface on a peripheral portion of the lens body, and the support portion further includes a third supporting surface that abuts and supports the third supported surface; The third supported surface is pressed against the third support surface by an elastic force of an elastic member or an elastic force of an elastic member separately provided between the supported member and the support portion, and A supported member supported by the support portion, wherein the third supported surface is a second plane parallel to the optical axis of the lens body at a minute distance and orthogonal to the first plane; It is configured above.
【００１７】このさらに別のレンズ支持構造によれば、
レンズ本体を有する被支持体は第１，第２の被支持面を
通る第１の平面および第３の被支持面を通る第２の平面
によって２方向に支持されることになる。これら第１、
第２の平面はレンズ本体の光軸に対してそれぞれ微少距
離隔てて平行に配置されているので、温度変化による被
支持体の膨張、収縮により、該被支持体の光軸は２方向
に微少量変化する。一方、光ヘッド内の光軸は該光ヘッ
ド内の各光学部品および支持部の温度変化による膨張、
収縮によって変化する。したがって、前記被支持体につ
いてレンズ本体の光軸と第１、第２の平面との間の前記
微少距離の方向および値をそれぞれ好適に設定すること
により、光ヘッド内の各光学部品および支持部の温度変
化による光軸の変化を打ち消して、光検出器の受光面で
の光軸の変化を２方向について抑えることができる。温
度変化による光検出器の受光面での光軸の変化を最大限
に抑えることができるレンズ本体の光軸と第１、第２の
平面との間の前記微少距離の方向および値の設計は、様
々な微少距離の方向および値に設計した被支持体を作成
し、前記同様に、他の光学素子等の設計がすべて終了し
該光学素子等が組み込まれている光ヘッドに該被支持体
を順次入れ替えて組み込み、温度変化による光検出器上
での光軸の変化をそれぞれ測定し、光軸の変化が最も小
さくなる設計を探し出すことにより行うことができる。According to this still another lens support structure,
The supported body having the lens body is supported in two directions by a first plane passing through the first and second supported surfaces and a second plane passing through the third supported surface. These first,
Since the second plane is disposed in parallel with the optical axis of the lens body at a minute distance from each other, the optical axis of the supported body is slightly fine in two directions due to expansion and contraction of the supported body due to a temperature change. Changes a small amount. On the other hand, the optical axis in the optical head expands due to a temperature change of each optical component and the supporting portion in the optical head,
It changes by contraction. Therefore, by suitably setting the direction and value of the minute distance between the optical axis of the lens body and the first and second planes of the supported body, each optical component and the support section in the optical head are set. The change in the optical axis due to the temperature change can be canceled, and the change in the optical axis on the light receiving surface of the photodetector can be suppressed in two directions. The design of the direction and value of the minute distance between the optical axis of the lens body and the first and second planes, which can minimize the change of the optical axis on the light receiving surface of the photodetector due to the temperature change, In the same manner as described above, a supported body designed in various directions and values of minute distances is created, and the design of the other optical elements and the like is completed, and the supported body is mounted on an optical head in which the optical elements and the like are incorporated. Are sequentially replaced, and the change of the optical axis on the photodetector due to the temperature change is measured, and the design that minimizes the change of the optical axis is searched for.
【００１８】なお、前記被支持体は例えばプラスチック
の一体成型で構成し、前記各支持面をレンズ本体の周縁
部からその外方に突出して構成された突出部の一側面に
構成することができる。It is to be noted that the supported body is formed by, for example, integral molding of plastic, and each of the support surfaces is formed on one side surface of a protruding portion formed by protruding outward from the peripheral edge of the lens body. .
【００１９】また、前記弾性部材は、例えば光ヘッドの
固定部分に一端部が支持され、他端部が前記被支持体の
外周面に押圧当接して前記弾性力を発生させる板ばねで
構成することができる。Further, the elastic member is constituted by, for example, a leaf spring having one end supported by a fixed portion of the optical head and the other end pressed against the outer peripheral surface of the supported member to generate the elastic force. be able to.
【００２０】また、この発明の光ヘッドは、上記いずれ
かのレンズ支持構造を光学系全体で１箇所有しているも
のである。これによれば、前述のように、他の光学素子
等の設計がすべて終了し該光学素子等が組み込まれてい
る光ヘッドに、様々な微少距離の方向および値に設計し
た被支持体を順次入れ替えて組み込み、温度変化による
光検出器上での光軸の変化をそれぞれ測定し、光軸の変
化が最も小さくなる該被支持体の設計を探し出せばよ
く、１箇所のレンズ支持構造の設計で温度変化による光
軸の変化を最小にする（光ヘッドの光学系の温度補償を
行う）ことができ、設計が容易である。The optical head according to the present invention has one of the above-mentioned lens support structures in one place in the entire optical system. According to this, as described above, the design of the other optical elements and the like is all completed, and the supported members designed in various directions and values of minute distances are sequentially placed on the optical head in which the optical elements and the like are incorporated. The change of the optical axis on the photodetector due to the temperature change should be measured and the design of the supported body that minimizes the change of the optical axis should be found. The change of the optical axis due to the temperature change can be minimized (the temperature of the optical system of the optical head is compensated), and the design is easy.
【００２１】[0021]
【発明の実施の形態】この発明が適用された光ヘッドの
光学系の構成例を図４に示す。レーザダイオード３８か
ら出射されたレーザ光４０はハーフミラー４２で反射さ
れ、コリメートレンズ４４および対物レンズ４６を通し
て光ディスク４８の記録面に照射されて、記録または再
生が行われる。その戻り光４０´は対物レンズ４６、コ
リメートレンズ４４、ハーフミラー４２および集光レン
ズ５０を通して光検出器５２に受光される。光検出器５
２に受光される戻り光の光軸５４は光検出器５２の中央
に来るように設計されているが、温度変化があると、各
光学部品やその支持部（光ヘッド内の固定部分）の膨
張、収縮により、光軸５４´で示すように変化する。そ
こで、例えば光検出器５２の直前の集光レンズ５０にこ
の発明のレンズ支持構造を適用することにより、光軸５
４´を光軸５４´´で示すように上記変化と逆方向に変
化させて、温度変化による光軸５４の変化を打ち消し
て、温度補償を行う。FIG. 4 shows an example of the configuration of an optical system of an optical head to which the present invention is applied. The laser light 40 emitted from the laser diode 38 is reflected by the half mirror 42 and is irradiated on the recording surface of the optical disk 48 through the collimator lens 44 and the objective lens 46, so that recording or reproduction is performed. The return light 40 'is received by the photodetector 52 through the objective lens 46, the collimator lens 44, the half mirror 42, and the condenser lens 50. Photodetector 5
2 is designed so that the optical axis 54 of the return light received at the center of the photodetector 52, but if there is a temperature change, each optical component and its supporting portion (fixed portion in the optical head) will The expansion and contraction change as shown by the optical axis 54 '. Therefore, for example, by applying the lens support structure of the present invention to the condenser lens 50 immediately before the photodetector 52, the optical axis 5
4 'is changed in a direction opposite to the above-mentioned change as indicated by an optical axis 54''to cancel a change in the optical axis 54 due to a temperature change, thereby performing temperature compensation.
【００２２】この発明のレンズ支持構造の各種実施の形
態を説明する。これらのレンズ支持構造は、例えば図４
の集光レンズ５０の支持構造に適用できるものである。Various embodiments of the lens support structure of the present invention will be described. These lens support structures are, for example, shown in FIG.
Can be applied to the support structure of the condenser lens 50 of FIG.
【００２３】（実施の形態１）この発明のレンズ支持構
造の第１の実施の形態を図１に示す。被支持体５８（集
光レンズ等）はプラスチックの一体成型品で全体が作ら
れている。被支持体５８には円柱状の外形を有するレン
ズ本体６０と突出部６２，６４，６６が構成されてい
る。突出部６２，６４はレンズ本体６０の周縁部の、該
レンズ本体６０の光軸（中心軸）６８を挟んで互いに反
対側の位置に光軸６８と平行な方向に延在して構成され
ている。突出部６２，６４の同じ側の側面６２ａ，６４
ａは第１、第２の被支持面を構成する。被支持面６２
ａ，６４ａは、光軸６８に対し微少距離Δｙ隔てて平行
な第１の平面７０上に構成されている。(Embodiment 1) FIG. 1 shows a first embodiment of the lens support structure of the present invention. The supported member 58 (condenser lens or the like) is made entirely of an integrally molded plastic product. The supported body 58 includes a lens body 60 having a columnar outer shape and protrusions 62, 64, and 66. The protruding portions 62 and 64 are configured to extend in a direction parallel to the optical axis 68 at positions opposite to each other with the optical axis (center axis) 68 of the lens main body 60 interposed therebetween at the peripheral edge of the lens main body 60. I have. Side surfaces 62a, 64 on the same side of protrusions 62, 64
a constitutes the first and second supported surfaces. Supported surface 62
a, 64a are formed on a first plane 70 which is parallel to the optical axis 68 at a minute distance Δy.
【００２４】突出部６６は、被支持体５８の下面に光軸
６８と平行な方向に延在して構成されている。突出部６
６の一方の側面６６ａは第３の被支持面を構成する。被
支持面６６ａは光軸６８に対して微少距離Δｘ隔てて平
行でかつ第１の平面７０に直交する第２の平面７２上に
構成されている。The projecting portion 66 is configured to extend on the lower surface of the supported member 58 in a direction parallel to the optical axis 68. Projection 6
The one side surface 66a of 6 constitutes a third supported surface. The supported surface 66 a is formed on a second plane 72 which is parallel to the optical axis 68 at a small distance Δx and is orthogonal to the first plane 70.
【００２５】光ヘッドの固定部分には所定幅の溝７４を
形成した支持部７６が構成されている。支持部７６は金
属ダイカスト等で作られている。溝７４の開口端両側の
位置で支持部７６の上面７６ａ，７６ｂは第１、第２の
支持面を構成している。また、溝７４内の底面の幅方向
中央部には段差が形成され、該段差が第１、第２の支持
面７６ａ，７６ｂと直角な第３の支持面７６ｃを構成し
ている。A support portion 76 having a groove 74 of a predetermined width is formed at a fixed portion of the optical head. The support part 76 is made of metal die casting or the like. The upper surfaces 76a and 76b of the support portion 76 at the positions on both sides of the opening end of the groove 74 constitute first and second support surfaces. In addition, a step is formed at the center in the width direction of the bottom surface in the groove 74, and the step forms a third support surface 76c perpendicular to the first and second support surfaces 76a and 76b.
【００２６】被支持体５８は溝７４内に挿入されて、第
１、第２、第３の被支持面６２ａ，６４ａ，６６ａを第
１、第２、第３の支持面７６ａ，７６ｂ，７６ｃにそれ
ぞれ当接させて支持部７６に支持されている。溝７４の
幅Ｗは被支持体５８の直径Ｌよりも少し大きく形成され
ている。溝７４の浅い部分の深さＤ１は被支持体５８の
直径Ｌよりも少し大きく形成され、深い部分の深さＤ２
は突出部６６の下端部と該溝７４の底面との間に適当な
ギャップが形成される大きさに形成されている。レンズ
本体６０の光軸６８は光ヘッド内の所定の光軸位置に一
致している。The supported member 58 is inserted into the groove 74, and the first, second, and third supported surfaces 62a, 64a, 66a are connected to the first, second, and third supporting surfaces 76a, 76b, 76c. And is supported by the support portion 76. The width W of the groove 74 is formed slightly larger than the diameter L of the supported member 58. The depth D1 of the shallow portion of the groove 74 is slightly larger than the diameter L of the supported member 58, and the depth D2 of the deep portion is
Is formed in such a size that an appropriate gap is formed between the lower end of the protrusion 66 and the bottom of the groove 74. The optical axis 68 of the lens body 60 coincides with a predetermined optical axis position in the optical head.
【００２７】押えばね７８は板ばねで構成され、一端
（図示せず）が支持部７６にねじ等で固定され、他端７
８ａ付近の一面が被支持体５８の外周面５８ａの斜め４
５°の角度位置（第１、第２の平面７０，７２の中間を
通る平面と外周面５８ａとの交線上の位置）に押圧当接
している。これにより、被支持体５８は第１、第２、第
３の被支持面６２ａ，６４ａ，６６ａが第１、第２の支
持面７６ａ，７６ｂ，７６ｃに押圧当接して支持部７６
に固定される。The pressing spring 78 is formed of a leaf spring, and one end (not shown) is fixed to the supporting portion 76 with a screw or the like.
8a is an oblique surface 4 of the outer peripheral surface 58a of the supported body 58.
It presses against an angular position of 5 ° (a position on a line of intersection between a plane passing through the middle between the first and second planes 70 and 72 and the outer peripheral surface 58a). As a result, the supported member 58 presses the first, second, and third supported surfaces 62a, 64a, and 66a against the first and second support surfaces 76a, 76b, and 76c, and supports the supported portion 76.
Fixed to
【００２８】微少距離Δｙ、Δｘの方向（極性）および
値は、該微少距離Δｙ、Δｘがあることによる温度変化
に伴う被支持体５８自体の光軸６８の変化が、光ヘッド
内の各光学部品および支持部７６の温度変化による光軸
の変化を打ち消して、光検出器の受光面での光軸の変化
を抑えるように設定する。The directions (polarities) and values of the minute distances Δy and Δx are determined by the change of the optical axis 68 of the supported member 58 itself due to the temperature change due to the existence of the minute distances Δy and Δx. The setting is made so that the change of the optical axis due to the temperature change of the parts and the supporting portion 76 is canceled out, and the change of the optical axis on the light receiving surface of the photodetector is suppressed.
【００２９】微少距離Δｘ（Δｙ）によるレンズ光軸６
８の変化量について説明する。被支持体５８をポリカー
ボネートの一体成型で構成し、支持部７６を亜鉛ダイカ
ストで構成するものとする。それぞれの線膨張係数Ｋは
次のとおりである。 ポリカーボネート：Ｋ＝７０×１０−６ 亜鉛ダイカスト：Ｋ＝２７×１０−６ レンズ光軸６８の変化量（ずれ量）ΔＬは、温度変化を
ΔＴとすると、 ΔＬ＝Δｘ×ΔＴ×（７０−２７）×１０−６ で表される。ここで、 Δｘ＝１．２ｍｍ に設定すると、温度が２５℃から４５℃に変化した場合
（すなわちΔＴ＝２０℃）のレンズ光軸６８の変化量
は、 ΔＬ＝１．０３μｍ となる。したがって、光ヘッド内の各光学部品および支
持部７６の温度変化による光検出器の受光面での光軸の
変化を打ち消すように微少距離Δｙ、Δｘの方向（極
性）および値を設定すれば、光検出器の受光面での光軸
の変化を抑えることができる。Lens optical axis 6 due to minute distance Δx (Δy)
8 will be described. The supported member 58 is formed by integral molding of polycarbonate, and the support portion 76 is formed by zinc die casting. The respective linear expansion coefficients K are as follows. Polycarbonate: K = 70 × 10 −6 Zinc die casting: K = 27 × 10 −6 The change amount (deviation amount) ΔL of the lens optical axis 68 is ΔL = Δx × ΔT × (70-27) where ΔT is a temperature change. ) × 10 −6 . Here, if Δx = 1.2 mm is set, the change amount of the lens optical axis 68 when the temperature changes from 25 ° C. to 45 ° C. (that is, ΔT = 20 ° C.) is ΔL = 1.03 μm. Therefore, if the directions (polarity) and values of the minute distances Δy and Δx are set so as to cancel the change of the optical axis on the light receiving surface of the photodetector due to the temperature change of each optical component in the optical head and the support portion 76, A change in the optical axis on the light receiving surface of the photodetector can be suppressed.
【００３０】（実施の形態２）この発明の第２の実施の
形態を図５に示す。被支持体８０はプラスチックの一体
成型品で全体が作られている。被支持体８０には円柱状
の外形を有するレンズ本体８２と突出部８４，８６が構
成されている。突出部８４，８６はレンズ本体８２の周
縁部の、該レンズ本体８２の光軸（中心軸）８８を挟ん
で互いに反対側の位置に光軸８８と平行な方向に延在し
て構成されている。突出部８４，８６の同じ側の側面８
４ａ，８６ａは第１、第２の被支持面を構成する。被支
持面８４ａ，８６ａは、光軸８８に対して微少距離Δｙ
隔てて平行な第１の平面９０上に構成されている。(Embodiment 2) FIG. 5 shows a second embodiment of the present invention. The supported body 80 is made entirely of a plastic integrally molded product. The supported body 80 includes a lens body 82 having a columnar outer shape and protrusions 84 and 86. The protruding portions 84 and 86 are configured to extend in a direction parallel to the optical axis 88 at positions on opposite sides of an optical axis (center axis) 88 of the lens main body 82 on a peripheral portion of the lens main body 82. I have. Side 8 on the same side of protrusions 84 and 86
Reference numerals 4a and 86a form first and second supported surfaces. The supported surfaces 84a and 86a are separated from the optical axis 88 by a minute distance Δy.
It is configured on a first parallel plane 90 that is separated and parallel.
【００３１】光ヘッドの固定部分には所定幅の溝９２を
形成した支持部９４が構成されている。支持部９４は金
属ダイカスト等で作られている。溝９２の開口端両側の
位置で支持部９４の上面９４ａ，９４ｂは第１、第２の
支持面を構成している。被支持体８０は溝９２内に挿入
されて、第１、第２の被支持面８４ａ，８６ａを第１、
第２の支持面９４ａ，９４ｂにそれぞれ当接させて支持
部９４に支持されている。溝９２の幅Ｗは被支持体８０
の直径Ｌとほぼ同じかまたはわずかに大きく形成されて
いる。レンズ本体８２の光軸８８は光ヘッド内の所定の
光軸位置に一致している。A support portion 94 having a groove 92 of a predetermined width is formed at a fixed portion of the optical head. The support portion 94 is made of metal die casting or the like. The upper surfaces 94a and 94b of the support portion 94 at the positions on both sides of the opening end of the groove 92 constitute first and second support surfaces. The supported member 80 is inserted into the groove 92 to move the first and second supported surfaces 84a and 86a to the first and second surfaces.
The support portions 94 support the second support surfaces 94a and 94b, respectively. The width W of the groove 92 is
Is formed to be almost the same as or slightly larger than the diameter L. The optical axis 88 of the lens body 82 coincides with a predetermined optical axis position in the optical head.
【００３２】押えばね９６は板ばねで構成され、一端
（図示せず）が支持部９４にねじ等で固定され、他端９
６ａの付近の一面が被支持体８０の外周面８０ａの頂部
（光軸８８を通りかつ第１の平面９０と直交する平面と
外周面８０ａとの交線上の位置）に押圧当接している。
これにより、被支持体８０は第１、第２の被支持面８４
ａ，８６ａが第１、第２の支持面９４ａ，９４ｂに押圧
当接して支持部９４に固定される。The pressing spring 96 is formed of a leaf spring, and one end (not shown) is fixed to the supporting portion 94 with a screw or the like.
One surface near 6a is in pressure contact with the top of the outer peripheral surface 80a of the supported member 80 (the position on the intersection line between the outer peripheral surface 80a and a plane passing through the optical axis 88 and orthogonal to the first plane 90).
As a result, the supported member 80 becomes the first and second supported surfaces 84.
a, 86a are pressed and abutted against the first and second support surfaces 94a, 94b, and are fixed to the support portion 94.
【００３３】以上の構成によれば、光ヘッド内の各光学
部品および支持部９４の温度変化による光検出器の受光
面での光軸の変化を打ち消すように微少距離Δｙの方向
（極性）および値を設定すれば、光検出器の受光面での
ｙ軸方向の光軸の変化を抑えることができる。According to the above configuration, the direction (polarity) of the minute distance Δy and the direction (polarity) of the minute distance Δy are canceled so as to cancel the change of the optical axis on the light receiving surface of the photodetector due to the temperature change of each optical component and the support portion 94 in the optical head. By setting the value, a change in the optical axis in the y-axis direction on the light receiving surface of the photodetector can be suppressed.
【００３４】（実施の形態３）この発明の第３の実施の
形態を図６に示す。支持体９８はプラスチックの一体成
型品で全体が作られている。被支持体９８には円柱状の
外形を有するレンズ本体１００と突出部１０２，１０
４，１０６，１０８が構成されている。突出部１０２，
１０４は光軸（中心軸）１１０方向の同じ位置でレンズ
本体１００の周縁部の、該レンズ本体１００の光軸１１
０を挟んで互いに反対側の位置に光軸１１０と平行な方
向に延在して構成されている。突出部１０２，１０４の
同じ側の側面１０２ａ，１０４ａは第１、第２の被支持
面を構成する。被支持面１０２ａ，１０４ａは、光軸１
１０に対して微少距離Δｄ１隔てて平行な第１の平面１
１２上に構成されている。(Embodiment 3) FIG. 6 shows a third embodiment of the present invention. The support 98 is made entirely of plastic and is integrally molded. The supported body 98 includes a lens body 100 having a cylindrical outer shape and projections 102 and 10.
4, 106 and 108 are constituted. Projecting part 102,
104 is the same position in the direction of the optical axis (center axis) 110 at the periphery of the lens body 100,
It extends in a direction parallel to the optical axis 110 at positions opposite to each other with respect to 0. Side surfaces 102a, 104a on the same side of the protruding portions 102, 104 constitute first and second supported surfaces. The supported surfaces 102a and 104a are connected to the optical axis 1
10 is a first plane 1 which is parallel with a minute distance Δd1
12.
【００３５】突出部１０６，１０８は光軸１１０方向の
同じ位置（突出部１０２，１０４とは光軸１１０方向お
よび周方向にずれた位置）にレンズ本体１００の周縁部
の、該レンズ本体１００の光軸１１０を挟んで互いに反
対側の位置に光軸１１０と平行な方向に延在して構成さ
れている。突出部１０６，１０８の同じ側の側面１０６
ａ，１０８ａは第３、第４の被支持面を構成する。被支
持面１０６ａ，１０８ａは光軸１１０に対して微少距離
Δｄ２隔てて平行な第２の平面１１４上に構成されてい
る。The protrusions 106 and 108 are located at the same position in the direction of the optical axis 110 (position shifted from the protrusions 102 and 104 in the direction of the optical axis 110 and in the circumferential direction). It extends in the direction parallel to the optical axis 110 at positions opposite to each other with respect to the optical axis 110. Sides 106 on the same side of protrusions 106, 108
a and 108a constitute third and fourth supported surfaces. The supported surfaces 106a and 108a are formed on a second plane 114 which is parallel to the optical axis 110 at a small distance Δd2.
【００３６】光ヘッドの固定部分には相互に連通した所
定幅の溝１１６，１１８を形成した支持部１２０が構成
されている。支持部１２０は金属ダイカスト等で作られ
ている。溝１１６の開口端両側の位置で支持部１２０の
上面１２０ａ，１２０ｂは第１、第２の支持面を構成し
ている。溝１１８の開口端両側の位置で支持部１２０の
上面１２０ｃ，１２０ｄは第３、第４の支持面を構成し
ている。A support portion 120 is formed in a fixed portion of the optical head. The support portion 120 has grooves 116 and 118 having a predetermined width communicating with each other. The support part 120 is made of metal die casting or the like. The upper surfaces 120a and 120b of the support portion 120 at the positions on both sides of the opening end of the groove 116 constitute first and second support surfaces. The upper surfaces 120c and 120d of the support portion 120 at the positions on both sides of the opening end of the groove 118 constitute third and fourth support surfaces.
【００３７】被支持体９８は溝１１６，１１８内に挿入
されて、第１、第２の被支持面１０８ａ，１０８ｂを第
１、第２の支持面１２０ａ，１２０ｂにそれぞれ当接さ
せ、第３、第４の被支持面１０８ｃ，１０８ｄを第３、
第４の支持面１２０ｃ，１２０ｄにそれぞれ当接させて
支持部１２０に支持されている。溝１１６，１１８の幅
Ｗは被支持体９８の直径Ｌよりも少し大きく形成されて
いる。レンズ本体１００の光軸１１０は光ヘッド内の所
定の光軸位置に一致している。The supported member 98 is inserted into the grooves 116 and 118 to bring the first and second supported surfaces 108a and 108b into contact with the first and second supporting surfaces 120a and 120b, respectively. , The fourth supported surfaces 108c, 108d
The support portions 120 support the fourth support surfaces 120c and 120d, respectively. The width W of the grooves 116 and 118 is formed slightly larger than the diameter L of the supported member 98. The optical axis 110 of the lens body 100 coincides with a predetermined optical axis position in the optical head.
【００３８】押えばね１２２は板ばねで構成され、一端
（図示せず）が支持部１２０にねじ等で固定され、他端
１２２ａ付近の一面が被支持体９８の外周面９８ａの頂
部（第１、第２の平面１１２，１１４の中間を通る平面
と外周面９８ａとの交線上の位置）に押圧当接してい
る。これにより、被支持体９８は第１、第２の被支持面
１０２ａ，１０４ａが第１、第２の支持面１２０ａ，１
２０ｂに押圧当接し、第３、第４の被支持面１０６ａ，
１０８ａが第３、第４の支持面１２０ｃ，１２０ｄに押
圧当接して支持部１２０に固定される。The presser spring 122 is formed of a leaf spring, and one end (not shown) is fixed to the support portion 120 with screws or the like, and one surface near the other end 122a is a top portion (first portion) of the outer peripheral surface 98a of the supported member 98. , At the intersection of the plane passing through the middle between the second planes 112 and 114 and the outer peripheral surface 98a). As a result, the supported member 98 has the first and second supported surfaces 102a and 104a which are the first and second supported surfaces 120a and 120a.
20b, the third and fourth supported surfaces 106a,
108a is fixed to the support part 120 by pressing against the third and fourth support surfaces 120c and 120d.
【００３９】以上の構成によれば、光ヘッド内の各光学
部品および支持部１２０の温度変化による光検出器の受
光面での光軸の変化を打ち消すように微少距離Δｄ１、
Δｄ２の方向（極性）および値を設定すれば、光検出器
の受光面での光軸の変化を抑えることができる。According to the above configuration, the minute distance Δd1 is set so as to cancel the change of the optical axis on the light receiving surface of the photodetector due to the temperature change of each optical component in the optical head and the support 120.
If the direction (polarity) and value of Δd2 are set, a change in the optical axis on the light receiving surface of the photodetector can be suppressed.
【００４０】なお、上記各実施の形態では、押えばねを
１個用いたが、押圧する方向ごとに別々に押えばねを配
置することもできる。また、上記各実施の形態では被支
持体はレンズ本体と突出部とを一体成型で構成したが、
別体で構成して組立てて一体化する構成とすることもで
きる。また、この発明の被支持体あるいはレンズ本体
は、プラスチックのみならず、ガラスで構成することも
できる。また、この発明のレンズ支持構造は、光検出器
の手前の集光レンズ以外にも適用することができる。ま
た、また、この発明のレンズ支持構造は、光ヘッドの光
学系内の１箇所に限らず、複数箇所に適用することもで
きる。In the above embodiments, one presser spring is used. However, a separate presser spring may be provided for each pressing direction. In each of the above embodiments, the supported member is formed by integrally molding the lens body and the protruding portion.
It is also possible to adopt a configuration in which the components are separately constructed, assembled and integrated. Further, the supported member or the lens body of the present invention can be made of not only plastic but also glass. Further, the lens support structure of the present invention can be applied to a device other than the condenser lens in front of the photodetector. Further, the lens support structure of the present invention is not limited to one location in the optical system of the optical head, and can be applied to a plurality of locations.
【図１】 この発明のレンズ支持構造の第１の実施の形
態を示す図で、（ａ）は光軸方向から見た図、（ｂ）は
（ａ）のＢ矢視図である。FIGS. 1A and 1B are diagrams showing a first embodiment of a lens support structure according to the present invention, wherein FIG. 1A is a view as viewed from an optical axis direction, and FIG.
【図２】 従来の支持構造を示す光軸方向から見た図で
ある。FIG. 2 is a diagram showing a conventional support structure viewed from an optical axis direction.
【図３】 温度変化による光軸変化を抑制した従来の支
持構造を示す図で、（ａ）は光軸方向から見た図、
（ｂ）は（ａ）のＡ矢視図である。FIG. 3 is a diagram showing a conventional support structure in which a change in the optical axis due to a temperature change is suppressed, and FIG.
(B) is an arrow A view of (a).
【図４】 この発明が適用された光ヘッドの光学系の構
成例を示す図である。FIG. 4 is a diagram showing a configuration example of an optical system of an optical head to which the present invention is applied.
【図５】 この発明のレンズ支持構造の第２の実施の形
態を示す図で、（ａ）は光軸方向から見た図、（ｂ）は
（ａ）のＤ矢視図である。FIGS. 5A and 5B are views showing a second embodiment of the lens support structure of the present invention, wherein FIG. 5A is a view as viewed from the optical axis direction, and FIG.
【図６】 この発明のレンズ支持構造の第３の実施の形
態を示す図で、（ａ）は光軸方向から見た図、（ｂ）、
（ｃ）はそれぞれ（ａ）のＥ矢視図、Ｆ矢視図である。6A and 6B are diagrams showing a third embodiment of the lens support structure of the present invention, wherein FIG. 6A is a diagram viewed from the optical axis direction, FIG.
(C) is an E arrow view and an F arrow view of (a), respectively.
５８，８０，９８…被支持体、６０，８２，１００…レ
ンズ本体、６２，６４，８４，８６，１０２，１０４，
１０６，１０８…突出部、６２ａ，８４ａ，１０２ａ…
第１の被支持面、６４ａ，８６ａ，１０４ａ…第２の被
支持面、６８，８８，１１０…レンズ本体の光軸、７
０，９０，１１２…第１の平面、７６，９４，１２０…
支持部、７６ａ，９４ａ，１２０ａ…第１の支持面、７
６ｂ，９４ｂ，１２０ｂ…第２の支持面、７８，９６，
１２２…押えばね（弾性部材）、６６ａ、１０６ａ…第
３の被支持面、１０８ａ…第４の被支持面、７６ｃ，１
２０ｃ…第３の支持面、１２０ｄ…第４の支持面、７
２，１１４…第２の平面。58, 80, 98 ... supported body, 60, 82, 100 ... lens body, 62, 64, 84, 86, 102, 104,
106, 108 ... projecting part, 62a, 84a, 102a ...
First supported surface, 64a, 86a, 104a... Second supported surface, 68, 88, 110.
0, 90, 112 ... first plane, 76, 94, 120 ...
Supporting portions, 76a, 94a, 120a: first supporting surface, 7
6b, 94b, 120b ... second support surface, 78, 96,
122: holding spring (elastic member), 66a, 106a: third supported surface, 108a: fourth supported surface, 76c, 1
20c: third support surface, 120d: fourth support surface, 7
2,114 ... second plane.
Claims (6)
ッド本体の支持部に支持して該被支持体を該光ヘッドの
所定の光軸位置に支持する構造であって、 前記被支持体が前記レンズ本体の周縁部の、該レンズ本
体の光軸を挟んで互いに反対側の位置に第１、第２の被
支持面を有し、 前記支持部が前記被支持体の前記第１、第２の被支持面
を当接支持する第１、第２の支持面を有し、 前記被支持体と前記支持部との間に弾性部材による弾性
力を介在させて、前記第１、第２の被支持面を前記第
１、第２の支持面にそれぞれ押圧当接して、該被支持体
を該支持部に支持してなり、 前記第１、第２の被支持面が前記レンズ本体の光軸に対
して微少距離隔てて平行な第１の平面上に構成されてい
る光ヘッドのレンズ支持構造。1. A structure in which a supported body on which a lens body is fixedly arranged is supported by a support portion of an optical head body, and the supported body is supported at a predetermined optical axis position of the optical head. A body having first and second supported surfaces at positions opposite to each other with respect to an optical axis of the lens body on a peripheral portion of the lens body, wherein the support portion is the first surface of the supported body; , A first and a second support surface for abutting and supporting a second supported surface, wherein an elastic force of an elastic member is interposed between the supported member and the support portion, and the first and second support surfaces are provided. The second supported surface is pressed against the first and second support surfaces, respectively, and the supported body is supported by the support portion. The first and second supported surfaces are the lenses A lens support structure for an optical head, which is configured on a first plane parallel to the optical axis of the main body at a very small distance.
の、該レンズ本体の光軸を挟んで互いに反対側の位置に
第３、第４の被支持面をさらに有し、 前記支持部が該第３、第４の被支持面を当接支持する第
３、第４の支持面をさらに有し、 前記弾性部材による弾性力または前記被支持体と前記支
持部との間に別途介在する弾性部材による弾性力によ
り、前記第３、第４の被支持面を前記第３、第４の支持
面にそれぞれ押圧当接して、該被支持体を該支持部に支
持してなり、 前記第３、第４の被支持面が前記レンズ本体の光軸に対
して微少距離隔てて平行な第２の平面上に構成されてい
る請求項１記載の光ヘッドのレンズ支持構造。2. The supporting member further includes third and fourth supported surfaces at positions on the periphery of the lens body opposite to each other with respect to the optical axis of the lens body. Further has third and fourth support surfaces for abutting and supporting the third and fourth supported surfaces, and an elastic force by the elastic member or a separate interposition between the supported member and the support portion. The third and fourth supported surfaces are pressed against and contacted with the third and fourth support surfaces, respectively, by the elastic force of the elastic member to support the supported member on the support portion. The lens support structure for an optical head according to claim 1, wherein the third and fourth supported surfaces are formed on a second plane parallel to the optical axis of the lens body at a minute distance.
第３の被支持面をさらに有し、 前記支持部が該第３の被支持面を当接支持する第３の支
持面をさらに有し、 前記弾性部材による弾性力または前記被支持体と前記支
持部との間に別途介在する弾性部材による弾性力によ
り、前記第３の被支持面を前記第３の支持面にそれぞれ
押圧当接して、該被支持体を該支持部に支持してなり、 前記第３の被支持面が、前記レンズ本体の光軸に対して
微少距離隔てて平行でかつ前記第１の平面に直交する第
２の平面上に構成されている請求項１記載の光ヘッドの
レンズ支持構造。3. The supported member further has a third supported surface at a peripheral portion of the lens body, and the support portion supports a third supporting surface that abuts and supports the third supported surface. The third support surface is pressed against the third support surface by an elastic force of the elastic member or an elastic force of an elastic member separately provided between the supported member and the support portion. The third supported surface is parallel to the optical axis of the lens body at a minute distance and is perpendicular to the first plane. 2. The lens support structure for an optical head according to claim 1, wherein the lens support structure is formed on a second plane.
構成され、前記各支持面が前記レンズ本体の周縁部から
その外方に突出して構成された突出部の一側面に構成さ
れている請求項１から３のいずれかに記載の光ヘッドの
レンズ支持構造。4. The supporting member is formed by integral molding of plastic, and each of the supporting surfaces is formed on one side surface of a projecting portion formed by projecting outward from a peripheral edge of the lens body. Item 4. A lens support structure for an optical head according to any one of Items 1 to 3.
部が支持され、他端部が前記被支持体の外周面に押圧当
接して前記弾性力を発生させる板ばねで構成されている
請求項１から４のいずれかに記載の光ヘッドのレンズ支
持構造。5. The elastic member includes a leaf spring having one end supported by a fixed portion of the optical head and the other end pressed against the outer peripheral surface of the supported member to generate the elastic force. A lens support structure for an optical head according to claim 1.
造を光学系全体で１箇所有している光ヘッド。6. An optical head having one lens support structure according to claim 1 in the entire optical system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11043750A JP2000242961A (en) | 1999-02-22 | 1999-02-22 | Lens supporting structure for optical head and optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11043750A JP2000242961A (en) | 1999-02-22 | 1999-02-22 | Lens supporting structure for optical head and optical head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000242961A true JP2000242961A (en) | 2000-09-08 |
Family
ID=12672453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11043750A Withdrawn JP2000242961A (en) | 1999-02-22 | 1999-02-22 | Lens supporting structure for optical head and optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000242961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7123553B2 (en) | 2002-05-31 | 2006-10-17 | Matsushita Electric Industrial Co., Ltd. | Lens support mechanism, optical head device and optical information processor |
-
1999
- 1999-02-22 JP JP11043750A patent/JP2000242961A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7123553B2 (en) | 2002-05-31 | 2006-10-17 | Matsushita Electric Industrial Co., Ltd. | Lens support mechanism, optical head device and optical information processor |
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