Light adjusting apparatus

Patent metadata

Field	Value
Publication number	US-9778454-B2
Application number	US-201514706174-A
Country	US
Kind code	B2
Filing date	May 7, 2015
Priority date	Nov 12, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A light adjusting apparatus including a drive section provided with an axial magnet, a coil core member and a coil, a first substrate provided an opening and a first cut-out portion, a second substrate provided with an opening and a second cut-out portion, located at a predetermined distance from the first substrate, an incident light adjusting section to which the axial magnet is joined, and an axial magnet support member provided with a distance keeping portion that keeps a distance between the coil core member and the axial magnet to within a certain range and a dropout prevention portion that prevents dropout of the axial magnet from the first cut-out portion, the axial magnet support member being fixed to the coil core member, in which the incident light adjusting section is rotated by the drive section for adjusting the incident light.

First claim

What is claimed is:

1. A light adjusting apparatus comprising:
a drive section comprising an axial magnet magnetized so as to have different magnetic poles around an axis, a coil core member located in proximity to a side face of the axial magnet at a core member end and a coil wound around the coil core member, the drive section rotating the axial magnet by transmitting a magnetic force generated by passing a current through the coil to the axial magnet via the coil core member;
a first substrate comprising a first light passage shaped portion for allowing incident light to pass therethrough and a first cut-out portion into which one end side of the axial magnet in an axial direction is inserted, on one side of which the coil and the coil core member are arranged;
a second substrate disposed parallel to the first substrate at a predetermined distance so as to face the other side of the first substrate comprising a second light passage shaped portion for allowing incident light to pass therethrough and a second cut-out portion for inserting the other end side of the axial magnet in the axial direction;
an incident light adjusting section to which the axial magnet is joined so as to rotate integrally therewith, disposed so as to rotate within the predetermined distance along with rotation of the axial magnet, and having a function of adjusting light; and
an axial magnet support member comprising a distance keeping portion fixed to the core member end, sandwiched between the core member end and the axial magnet to keep a distance between the core member end and the axial magnet to within a certain range and a dropout prevention portion for preventing dropout of the axial magnet from the first cut-out portion,
wherein the incident light adjusting section is rotated by the drive section via the axial magnet to be displaced to a retracted position retracted from an optical path of the incident light that passes through the first light passage shaped portion and the second light passage shaped portion, and to an inserted position located in the optical path of the incident light to thereby adjust the incident light,
the coil core member is formed in an open curved shape, the coil core member having a pair of core member ends that sandwiches both sides of the axial magnet, and the coil core member and the axial magnet together form a closed magnetic circuit,
the axial magnet support member is fixed to both of the pair of core member ends, and the distance keeping portion is sandwiched between the pair of core member ends and the axial magnet to keep the distance between both sides of the axial magnet and the pair of core member ends to within a certain range, and
the axial magnet support member has a cylindrical shape including an axial orifice parallel to the axial direction to insert the axial magnet therethrough, a cylindrical portion facing the pair of core member ends in the cylindrical shape is the distance keeping portion and a cylindrical portion opposite to the first light passage shaped portion in the cylindrical shape is the dropout prevention portion.

2. The light adjusting apparatus according to claim 1 , wherein the axial magnet support member has a length in the axial direction such that it is disposed on the one side of the first cut-out portion on the first substrate.

3. The light adjusting apparatus according to claim 1 , wherein
the first cut-out portion is formed into a shape that allows the cylindrical outside surface of the axial magnet support member to be inserted therein,
the axial magnet support member is extended from the one side to the other side of the first substrate via the first cut-out portion, and
the axial magnet is pivotably supported by the axial magnet support member during rotation.

4. The light adjusting apparatus according to claim 3 , wherein the axial magnet support member further comprises a positioning portion that is fixed in contact with the one side of the first substrate to position the axial orifice so as to be parallel to the axial direction.

5. The light adjusting apparatus according to claim 1 , further comprising a spacer that is sandwiched between the first substrate and the second substrate to define the predetermined distance.

6. The light adjusting apparatus according to claim 1 , further comprising a distance keeping member that regulates a movement in the axial direction of the incident light adjusting section to thereby keep the distance between the incident light adjusting section and the first substrate to a predetermined distance or more.

7. The light adjusting apparatus according to claim 6 , wherein the distance keeping member is disposed so as to cover the opposite side of the incident light adjusting section of the axial magnet support member, and regulates a movement in the axial direction of the axial magnet to thereby keep the distance between the incident light adjusting section and the first substrate to a predetermined distance or more.

8. The light adjusting apparatus according to claim 6 , wherein the distance keeping member is disposed sandwiched between the first substrate and the incident light adjusting section to keep the distance between the incident light adjusting section and the first substrate to a predetermined distance or more.

9. The light adjusting apparatus according to claim 1 , wherein the axial magnet is pivotably supported on one end side in the axial direction by the axial magnet support member and the first cut-out portion during rotation and pivotably supported on the other end side in the axial direction by the second cut-out portion.

Assignees

• Olympus Corp

Inventors

• Matsuki Kaoru
• Suga Takeshi

Classifications

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title

• G03B9/02 Primary

  Diaphragms · CPC title

• G02B26/00 Primary

  Optical devices or arrangements for the control of light using movable or deformable optical elements (control of light by modification of the optical properties of the media of the elements involved therein G02F1/00) · CPC title

• G02B7/16

  Rotatable turrets · CPC title

• G02B7/006

  Filter holders · CPC title